fix(app): pretty-print JSON on a terminal and reconcile the foundation streams

writeJSON uses the indented, colored JSON writer when stdout is a
terminal. Help and JSON tests now expect the -L shorthand column and
compare terminal JSON without color sequences.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/app_test.go

@@ -250,7 +250,7 @@ func TestCommandHelpShowsRelevantFlagsOnly(t *testing.T) {
 	for _, want := range []string{
 		"\nUSAGE\n  tea issue list [flags]\n",
 		"\nALIASES\n  tea issue ls\n",
-		"\nFLAGS\n  --assignee string ",
+		"\nFLAGS\n      --assignee string ",
 		"\nINHERITED FLAGS\n  -R, --repo OWNER/REPO ",
 		"\n      --json fields ",
 		"\n  -q, --jq expression ",
@@ -264,7 +264,7 @@ func TestCommandHelpShowsRelevantFlagsOnly(t *testing.T) {
 	}
 	out.Reset()
 	require.NoError(t, Execute(context.Background(), deps, []string{"label", "list", "--help"}))
-	require.Contains(t, out.String(), "\nFLAGS\n  --limit int    Maximum results (1..100) (default 30)\n  --org string ")
+	require.Contains(t, out.String(), "\nFLAGS\n  -L, --limit int    Maximum number of results (1..1000) (default 30)\n      --org string ")
 	for _, args := range [][]string{{"version", "--help"}, {"alias", "list", "--help"}, {"auth", "status", "--help"}} {
 		out.Reset()
 		require.NoError(t, Execute(context.Background(), deps, args))